Synthesis of (E)-α,β-unsaturated ketones with total or high diastereoselectivity by using samarium diiodide or triiodide
作者:José M Concellón、Mónica Huerta
DOI:10.1016/s0040-4039(03)00079-0
日期:2003.2
(E)-alpha,beta-Unsaturated ketones are obtained by reaction of alpha-chloro-beta-hydroxy ketones with samarium diiodide or with samarium triiodide with total or high diastereoselectivity and in good yield. (C) 2003 Elsevier Science Ltd. All rights reserved.
An efficient synthesis of (E)-α,β-unsaturated ketones and esters with total stereoselectivity by using chromium dichloride
作者:José M. Concellón、Humberto Rodríguez-Solla、Carmen Méjica
DOI:10.1016/j.tet.2006.01.052
日期:2006.4
(E)-α,β-Unsaturatedketones 1 or esters 2 can be obtained with complete stereoselectivity by reaction of different 2-chloro-3-hydroxy ketones 3 or esters 4 and CrCl2. A comparative study of the results of synthesis of ketones 1 with CrCl2 or samarium is performed. A mechanism to explain both β-elimination reactions has been proposed.